The Medical Physics in the School of Physics, Universiti Sains Malaysia is a rapidly expanding discipline which involves the application of physics-based principles and techniques to matters of medical diagnosis and treatment. The subject focused on the use of ionizing radiations in both the diagnostic and therapeutic applications, in particular the diagnostic radiology, computed tomography, radiotherapy and nuclear medicine; new physical techniques in medical instrumentations, e.g. magnetic resonance imaging, ultrasound and medical lasers; medical imaging and applications of computers in medicine. A Medical Physicist is involved in the calibration, maintenance, usage and radiation safety of the various medical instruments used in hospitals and industries.